Anti-dazzle automobile headlight



Aug. 30, 1966 R. MICKLEY ANTI-DAZZLE AUTOMOBILE HEADLIGHT Filed July 23, 1963 R w w 3 y m M Y 4 7 m o 6 w G W U m kw! 3 +1 I M w 1 m 5 h F m F G F M I L F m 8 W J 2 P m u H 3 F u w M 7 W E o m 4 5 m m 6 F J n m a l, fl 9A m v 6 4 I United States Patent 3,270,195 ANTI-DAZZLE AUTOMOBILE HEADLIGHT Rolf Mickley, Elisabethstr. 8, Munich, Germany Filed July 23, 1963, Ser. No. 297,033 Claims priority, application Germany, July 24, 1962, M 53,680 4 Claims. (Cl. 240-4135) The invention relates to an automobile headlight for non-dazzling high and down beams, being a further development of the invention described in the main US. patent application Serial No. 207,678 filed July 5, 1962, now Patent No. 3,200,282 of August 10-, 1965, and related U.S. applications Serial Nos. 220,831 filed August 3-1, 1962, now Patent No. 3,202,858 of August 24, 1965, and Serial No. 228, 928 filed Oct. 8, 1962, now Patent No. 3,200,281 of August 10, 1965.

In modifying the conventional incandescent lamp form, however, for the purpose of achieving optimum optical efliciency in the sense of a sharply focused horizontal radiation at the center of the headlamp while simultaneously screening off the otherwise dazzling, stray upward radiation, the lamp of the present invention is constructed as a headlight with paraboloid reflector of essentially conventional form with .only one anti-dazzle shield arranged above the horizontal plane of the headlights optical axis, said anti-dazzle shields dimensions being limited in the forward direction by the plane normal to the optical axis through the focal point of the paraboloid and the high-beam filament being located in the plane of the optical .axis and being moved back of or arranged to enclose the focal point so closely that the anti-dazzle shield of said application Serial No. 207,678, for example, mounted in front of the focal point in the direction of the radiation and below the optical axis, can be dispensed with so that the upper anti-dazzle shield :arranged behind the focal point suffices for both a nondazzling high-beam and a low-beam.

Furthermore, the described incandescent lamp in headlight form offers the additional advantage, that by means of the lens enclosing the forward end of the optical system, it may be arranged that the retracting and dispersing means and elements of such lenses are included or installed only in those locations and on those parts where they are beneficial for an exact horizontal limitation of the said headlights radiation in the high and low beam, but may otherwise be partly or wholly dispensed with in order to achieve an optimum illumination level for the high beam, which is sharply focused at the center of the headlight.

A form of embodiment of a headlight according to the invention is illustrated in the accompanying drawing, wherein:-

FIGURE 1 shows a headlight diagrammatically in vertical section.

FIGURE 2 shows the example of embodiment of a U-shaped filament for the high beam with shielding, seen from below.

FIG. 3 shows the same filament with shielding, seen from above.

FIGURE 4 shows the example of embodiment of a high-beam filament lying straight along the optical axis through the focal point with shielding, seen from below.

FIGURE 5 shows the same filament with shielding, seen from above.

FIGURE 6 shows the example of embodiment of a high-beam filament extending through the focal point transversely of the optical axis with shielding, seen from below.

FIGURE 7 shows the same filament with shielding, seen from above.

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FIGURE 8 is a side view showing cross-section of the anti-dazzle shielding in the form of a semi-paraboloid.

In the drawing, according to FIGURE 1 the dimensions of the shielding 4 lying behind the focal point 2 are limited horizontally by the plane passing through the optical axis 1 of the associated paraboloid reflector 5 and vertically by the plane 3 normal to the optical axis and passing through the focal point of the paraboloid. The high-beam filament 6 lying substantially in the horizontal plane containing the optical axis 1 is moved so far back into the focal point or encloses the focal point so closely that a non-dazzling high and low beam is produced. The low beam filament lies in the same plane as the high-beam filament and therefore cannot be shown separately in this figure,

The headlight is preferably fitted with a disc or lens 15 which is light refractive (and possibly prismatic so that the light rays 20 issue horizontally or at a slight downward inclination from the lens) in those areas above the horizontal plane 16 passing through the uppermost intersection 17 of the vertical line through the focal point 2 with the reflector 5 and below the plane containing the optical axis 1, down to the horizontal plane 18, passing through the undermost intersection 19 of the vertical line through the focal point with the reflector.

FIGURES 2 and 3 demonstrate an example of a U- shaped filament for the high beam 6 with a down-beam filament 7 located behind the focal point 2 and between the arms of the high-beam filament, both in the radiation direction of the optical axis 1, the said filaments being provided with shielding 4 which limits the rearward solid angle of the reflector with regard to emission of radiation, but on the other hand reflects the rays concerned on to the entire lower half of the reflector without causing dazzling glare.

The FIGURES 4 and 5 show the same system employing a high-beam filament 8 lying along the optical axis 1 through the focal point 2 and delimiting the latter, while in this case the down-beam filaments 9 lie in similar positions, behind the focal point and on both sides of the high-beam filament.

The FIGURES 6 and 7 demonstrate an arrangement employing a high-beam filament 10 located at the focal point 2 and at right angles to the optical axis 1, the filament portions extending behind the focal point being covered in a similar manner by the shielding 4 while the down-beam filament 11 is arranged behind it along the optical axis.

FIGURE 8 is a side view showing in cross section, an anti-dazzle shielding in the form of a semi-paraboloid 12 which occupies the same position in. the reflector as the shielding 4, that is, its dimensions are limited horizont'ally by the optical axis 1 and vertically by the plane 3 normal to the optical axis and passing through the focal point 2 of the paraboloid 5; the filament portions protruding into the space behind the focal point 2 of the main reflector 5 extend in this case, at. the very utmost, to the horizontal limit defined by the plane 13 passing through the focal point 14 of the semi-paraboloid antidazzle shielding. The figure actually shows the rearwardly extending filament portion of the high-beam filament 6 extending only about half way back toward said focal point 14.

What is claimed is:

1. In a non-dazzling incandescent lamp constructed as a headlight with a paraboloid reflector comprising two incandescent filaments for high and low beams, the improved anti-dazzling construction comprising a high beam filament having a portion thereof extending slightly beyond the focal point of said reflector in the direction of radiation, a low beam filament symmetrically positioned with respect to the high beam filament and extending entirely back of the focal point of said reflector in the horizontal plane of the axis of said reflector, the improvement comprising a single anti-dazzle shield extending over those portions of said filaments lying back of the focal point of said reflector in the horizontal plane of the axis of said reflector, said anti-dazzle shield being constructed in the form of a halved paraboloid reflector with an internal mirrored surface whose optical axis coincides with that of the main paraboloid reflector, those portions of the filaments extending into the space behind the focal point of the main paraboloid reflector extending at the utmost to the limit defined by the vertical plane through the focal point of the halved paraboloid anti-dazzle shield.

2. The headlight as claimed in claim 1, wherein said high beam filament is straight and lies along the optical to the rear of the focal point between the arms of said high beam filament.

4. The headlight as claimed in claim 1, wherein said high beam filament extends horizontally through the 0- cal point along a substantially straight line at right angles to the optical axis of said main paraboloid reflector, said low beam filament extending back of the high beam filament along the optical axis of said main paraboloid reflector.

References Cited by the Examiner UNITED STATES PATENTS 2,146,593 2/1939 Roper 24041.25 2,214,472 9/1940 Lund 240-41.25 2,617,062 11/1952 Rijnders 240-4135 3,107,866 10/1963 Nowak 240-4125 FOREIGN PATENTS 240,339 8/ 1962 Australia. 1,202,822 7/1959 France.

NORTON ANSHER, Primary Examiner.

C. C. LOGAN, Assistant Examiner. 

1. IN A NON-DAZZLING INCANDESCENT LAMP CONSTRUCTED AS A HEADLIGHT WITH A PARABOLOID REFLECTOR COMPRISING TWO INCANDESCENT FILAMENTS FOR HIGH AND LOW BEAMS, THE IMPROVED ANTI-DAZZLING CONSTRUCTION COMPRISING A HIGH BEAM FILAMENT HAVING A PORTION THEREOF EXTENDING SLIGHTLY BEYOND THE FOCAL POINT OF SAID REFLECTOR IN THE DIRECTION OF RADIATION, A LOW BEAM FILAMENT SYMMETRICALLY POSITIONED WITH RESPECT TO THE HIGH BEAM FILAMENT AND EXTENDING ENTIRELY BACK OF THE FOCAL POINT OF SAID REFLECTOR IN THE HORIZONTAL PLANE OF THE AXIS OF SAID REFLECTOR, THE IMPROVEMENT COMPRISING A SINGLE ANTI-DAZZLE SHIELD EXTENDING OVER THOSE PORTIONS OF SAID FILAMENTS LYING BACK OF THE FOCAL POINT OF SAID REFLECTOR IN THE HORIZONTAL PLANE OF THE AXIS OF SAID REFLECTOR, SAID ANTI-DAZZLE SHIELD BEING CONSTRUCTED IN THE FORM OF A HALVED PARABOLOID REFLECTOR WITH AN INTERNAL MIRRORED SURFACE WHOSE OPTICAL AXIS COINCIDES WITH THAT OF THE MAIN PARABOLOID REFLECTOR, THOSE PORTIONS OF THE FILAMENTS EXTENDING INTO THE SPACE BEHIND THE FOCAL POINT OF THE MAIN PARABOLOID REFLECTOR EXTENDING AT THE UTMOST TO THE LIMIT DEFINED BY THE VERTICAL PLANE THROUGH THE FOCAL POINT OF THE HALVED PARABOLOID ANTI-DAZZLE SHIELD. 